Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1997-03-27
1998-10-20
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315224, 315209R, 315307, 315219, 315244, 315DIG7, G05F 100
Patent
active
058251367
ABSTRACT:
The circuit arrangement according to the invention has a self-oscillating inverter having at least two alternately switching transistors (Q1, Q2), a load circuit connected to the inverter output and designed as a resonant circuit (L1, C1), and terminals for at least one electric lamp (LP). According to the invention, the control junction of a transistor (T1) is arranged in the emitter line of one of the inverter transistors (Q2). Via the variable conductivity of this control junction, the effective emitter resistance of the inverter transistor (Q2) is continuously varied as a function of the voltage drop across one of the resonant circuit components (C1), and the clock frequency of the inverter (Q1, Q2) is thereby increased so far that because of the now stronger detuning with respect to the resonant frequency of the resonant circuit (C1, L1) a reduction in the no-load voltage in the load circuit is achieved.
REFERENCES:
patent: 4547706 (1985-10-01), Krummel
patent: 5422546 (1995-06-01), Nilssen
patent: 5589740 (1996-12-01), Rudolph et al.
"Schaltnetzteile: Konzepte, Bauelemente, Anwendungen", Hirschmann et al, 62-63.
Einfuhrung in die Elektronik, Boger et al, pp. 395-396.
Bessone Carlo S.
Pascal Robert J.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MBH
Philogene Haissa
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